Hey Guilhem. I've just wondered whether the way you've mentioned above is still valid respectively considered "stable" now (as it: for use by keyscripts)? :-)
And further, did I understand it right, that $DESTDIR/cryptroot/crypttab would contain one line (in the crypttab syntax) per device that needs unlocking in the initramfs? Which could then of course mean, that each line uses a different keyscript. Thanks, Chris.